Resin composition

Abstract

The present invention provides a resin composition comprising: (a) a polyolefin resin in an amount of 20-95% by weight, (b) a polyphenylene ether resin in an amount of 80-5% by weight, (c) a partially hydrogenated alkenyl aromatic compound-isoprene block copolymer in an amount of 3-45 parts by weight based on totally 100 parts by weight of the components (a) and (b), and (d) an ethylene-α-olefin copolymer elastomer modified by grafting thereon a graft monomer such as an unsaturated monocarboxylic acid or a derivative thereof, an unsaturated dicarboxylic acid or a derivative thereof, a styrene compound, or an unsaturated epoxy compound or an α-olefin-alkyl (meth)acrylate copolymer such as a copolymer of an α-olefin of 2-6 carbon atoms and an alkyl (meth)acrylate having an alkyl group of 1-8 carbon atoms in an amount of 3-45 parts by weight based on totally 100 parts by weight of the components (a) and (b).

What is claimed is: 
     
       1. A resin composition which comprises: (a) a polyolefin resin in an amount of 20-95% by weight,   (b) a polyphenylene ether resin in an amount of 80-5l% by weight,   (c) a partially hydrogenated alkenyl aromatic compound-isoprene block copolymer in an amount of 3-45 parts by weight based on a total of 100 parts by weight of the components (a) and (b), and   (d) a modified ethylene-α-olefin copolymer elastomer or an α-olefin-alkyl (meth)acrylate copolymer in an amount of 3-45 parts by weight based on a total of 100 parts by weight of the components (a) and (b).   
     
     
       2. A resin composition according to claim 1, wherein the modified ethylene-α-olefin copolymer (d) is an ethylene-α-olefin copolymer modified with an unsaturated monocarboxylic acid or a derivative thereof, an unsaturated dicarboxylic acid or a derivative thereof, a styrene compound, or an unsaturated epoxy compound. 
     
     
       3. A resin composition according to claim 1, wherein the α-olefin-alkyl (meth)acrylate copolymer (d) is a copolymer of an α-olefin of 2-6 carbon atoms and an alkyl (meth)acrylate having an alkyl group of 1-8 carbon atom. 
     
     
       4. A resin composition according to claim 1, wherein the polyolefin resin (a) is a homopolymer of an α-olefin of 3 or more carbon atoms, copolymer of an α-olefin of 3 or more carbon atoms with other α-olefin, a mixture thereof, copolymer of an α-olefin of 3 or more carbon atoms with other unsaturated monomer or oxidized, halogenated or sulfonated product of the above polymer. 
     
     
       5. A resin composition according to claim 1, wherein the polyolefin resin (a) is a crystalline propylene homopolymer or copolymer. 
     
     
       6. A resin composition according to claim 5, wherein the crystalline propylene homopolymer or copolymer has a melt flow rate of 0.01-400 g/10 min. 
     
     
       7. A resin composition according to claim 1, wherein the polyphenylene ether resin (b) has recurring unit represented by the following formula: ##STR3## wherein ether oxygen atom links to benzene nucleus in the next adjacent unit, n is at least 30, a plurality of R each represents a hydrogen atom, a halogen atom, a hydrocarbon group containing no tertiary α-carbon atom, a halo-hydrocarbon group having at least two carbon atoms between halogen atom and phenyl nucleus, a hydrocarbon oxy group, or a halohydrocarbon oxy group having at least two carbon atoms between halogen atom and phenyl nucleus. 
     
     
       8. A resin composition according to claim 1, wherein the polyphenylene ether resin (b) has an intrinsic viscosity of 0.2-0.7 dl/g. 
     
     
       9. A resin composition according to claim 1, wherein the partially hydrogenated alkenyl aromatic compound-isoprene block copolymer (c) is an alkenyl aromatic compound-isoprene block copolymer which has a structure containing at least one chain block originating from the alkenyl aromatic compound and at least one chain block originating from the isoprene and in which content of aliphatic unsaturated group in the block originating from the isoprene is reduced by hydrogenation. 
     
     
       10. A resin composition according to claim 9, wherein the alkenyl aromatic compound has the chemical structure represented by the following formula: ##STR4## wherein R 1  and R 2  each represents hydrogen atom or a lower alkyl or alkenyl group of 1-6 carbon atoms, R 3  and R 4  each represents a hydrogen atom, a lower alkyl group of 1-6 carbon atoms, a chlorine atom or a bromine atom, and R 5 , R 6  and R 7  each represents a hydrogen atom or a lower alkyl or alkenyl group of 1-6 carbon atoms and R 6  and R 7  may link together with a hydrocarbyl group to form a naphthyl group together with the benzene ring. 
     
     
       11. A resin composition according to claim 10 wherein the alkenyl aromatic compound is styrene. 
     
     
       12. A resin composition according to claim 9, wherein content of the block originating from the alkenyl aromatic compound in the block copolymer (c) is higher than 20% by weight and at most 80% by weight. 
     
     
       13. A resin composition according to claim 9, wherein content of unsaturated bond originating from aliphatic chain and remaining without hydrogenation in block copolymer (c) is 50% by weight or less. 
     
     
       14. A resin composition according to claim 1, wherein the block copolymer (c) has a number-average molecular weight of 5,000-500,000 g/mol. 
     
     
       15. A resin composition according to claim 1, wherein the ethylene-α-olefin copolymer of component (d) has an ethylene content of 30-93 mol %. 
     
     
       16. A resin composition according to claim 3, the ethylene-α-olefin copolymer of component (d) has an ethylene content of 30-93 mol %. 
     
     
       17. A resin composition according to claim 1, wherein the ethylene-α-olefin copolymer of component (d) has a melt flow rate of 0.1-50 g/10 min at 190° C. 
     
     
       18. A resin composition according to claim 1, wherein the ethylene-α-olefin copolymer of component (d) has a density of 0.90 g/cm or less. 
     
     
       19. A resin composition according to claim 1, wherein the α-olefin unit which constitutes the ethylene-α-olefin copolymer has 3-18 carbon atoms. 
     
     
       20. A resin composition according to claim 1, wherein the modification of the ethylene-α-olefin copolymer is carried out by grafting the unsaturated monocarboxylic acid or derivative thereof, the unsaturated dicarboxylic acid or derivative thereof, the styrene compound or the unsaturated epoxy compound on the copolymer. 
     
     
       21. A resin composition according to claim 20, wherein the graft ratio of the unsaturated monocarboxylic acid or derivative thereof, the unsaturated dicarboxylic acid or derivative thereof or the unsaturated epoxy compound is 0.05-10 parts by weight per 100 parts by weight of the ethylene-a-olefin copolymer. 
     
     
       22. A resin composition according to claim 20, wherein the graft ratio of the styrene compound is 0.3-50 parts by weight per 100 parts by weight of the ethylene-α-olefin copolymer. 
     
     
       23. A resin composition according to claim 2, wherein the unsaturated monocarboxylic acid or derivative thereof is acrylic acid, methacrylic acid or methyl methacrylate. 
     
     
       24. A resin composition according to claim 2, wherein the unsaturated dicarboxylic acid or derivative thereof is maleic anhydride, maleic acid, fumaric acid or nadic anhydride. 
     
     
       25. A resin composition according to claim 2, wherein the styrene compound is the alkenyl aromatic compound which constitutes the partially hydrogenated alkenyl aromatic compound-isoprene block copolymer. 
     
     
       26. A resin composition according to claim 2, wherein the unsaturated epoxy compound is a compound having both unsaturated bond and epoxy group in a molecule. 
     
     
       27. A resin composition according to claim 26, wherein the unsaturated epoxy compound is a glycidyl ester of an unsaturated carboxylic acid. 
     
     
       28. A resin composition according to claim 3, wherein the copolymer of α-olefin and alkyl (meth)acrylate (d) has an acrylate content or a methacrylate content of about 3-30% by weight. 
     
     
       29. A resin composition according to claim 3, wherein the copolymer of α-olefin and alkyl (meth)acrylate (d) has a functional group selected from the group consisting of carboxylic acid group, acid anhydride group, acid amide group, imide group, hydroxyl group and epoxy group.